<template>
    <div>
         <!-- 面包屑导航区域 -->
        <el-breadcrumb separator="/">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区 -->
        <el-card>
            <!-- 提示区 -->
            <el-alert
                title="添加商品信息" center show-icon :closeable="false" type="info">
            </el-alert>
             <!-- 步骤条 -->
            <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>

            <!-- tab栏区域 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef"
            label-width="100px" label-position="top">
                <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name='0'>
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name">
                            </el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number">
                            </el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight" type="number">
                            </el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number">
                            </el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                             <el-cascader
                                v-model="addForm.goods_cat"
                                :options="catelist"
                                :props="cateProps"
                                @change="handleChange">
                            </el-cascader>
                        </el-form-item>
                    </el-tab-pane>

                    <el-tab-pane label="商品参数" name='1'>
                        <!-- 渲染表单的Item项 -->
                        <el-form-item v-for="item in manyTableData" :label="item.attr_name" :key="item.attr_id">
                            <!-- 复选框组 -->
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox border :label="cb" v-for="(cb,i) in item.attr_vals" :key="i"></el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>

                    <el-tab-pane label="商品属性" name='2'>
                        <el-form-item v-for="item in onlyTableData" :label="item.attr_name" :key="item.attr_id">
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>

                    <el-tab-pane label="商品图片" name='3'>
                        <!-- action表示图片要上传到的后台api地址 -->
                        <el-upload
                            :headers="headersObj" :on-success="handleSuccess"
                            action="http://127.0.0.1:8888/api/private/v1/upload"
                            :on-preview="handlePreview"
                            :on-remove="handleRemove"
                            list-type="picture">
                            <el-button size="small" type="primary">点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>

                    <el-tab-pane label="商品内容" name='4'>
                        <quill-editor v-model="addForm.good_introduce"></quill-editor>
                        <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>
        
        <!-- 图片预览 -->
        <el-dialog
            title="图片预览"
            :visible.sync="previewVisible"
            width="50%">
            <img :src="previewPath" class="previewImg">
        </el-dialog>

    </div>
</template>

<script>
export default {
    data() {
        return {
            activeIndex: '0',
            //添加商品的表单数据对象
            addForm: {
                //添加商品的表单数据对象
                goods_name:'',
                goods_price: 0,
                goods_weight: 0,
                goods_number: 0,

                //商品所属的分类数据
                goods_cat:[],
                // 图片数组
                pics:[],
                //商品的属性详情
                good_introduce:'',

                attrs:[]
            },
            addFormRules:{
                goods_name:[
                    { required: true, message:'请输入商品名称', trigger: 'blur' }
                ],
                goods_price:[
                    { required: true, message:'请输入商品价格', trigger: 'blur' }
                ],
                goods_weight:[
                    { required: true, message:'请输入商品重量', trigger: 'blur' }
                ],
                goods_number:[
                    { required: true, message:'请输入商品数量', trigger: 'blur' }
                ],
                goods_cat:[
                    { required: true, message:'请选中商品分类', trigger: 'blur' }
                ]
            },
            //商品分类列表
            catelist:[],
            cateProps:{ 
                label: 'cat_name',
                value: 'cat_id',
                children: 'children',
                expandTrigger: 'hover' 
            },
            //动态参数列表数据
            manyTableData: [],
            //静态属性列表数据
            onlyTableData: [],

            //图片上传组件的header请求头对象
            headersObj: {
                Authorization:
                window.sessionStorage.getItem('token')
            },
            // 图片预览路径
            previewPath:'',
            previewVisible:false
        }
    },

    created() {
        this.getCateList()
    },

    methods: {
        //获取所有商品分类数据
        async getCateList(){
            const{data:res} = await this.$http.get('categories')

            if(res.meta.status !==200) return this.$message.error('获取商品分类数据失败'); 
            this.catelist = res.data
        },
        //级联选择器选择项变化，会触发这个函数
        handleChange(){
            if(this.addForm.goods_cat.length !==3){
                this.addForm.goods_cat = []
            }
        },
        beforeTabLeave(activeName,oldActiveName){
             if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3){
                this.$message.error('请先选择商品分类')
                return false
            }   
        },
        async tabClicked(){
            if(this.activeIndex === '1'){
                const{data: res} = await this.$http.get(`categories/${this.addForm.goods_cat[2]}/attributes`,{params: {sel:'many'}})
                if(res.meta.status !==200){
                    return this.$message.error('获取动态参数列表失败!')
                }
                res.data.forEach(item =>{
                     item.attr_vals = item.attr_vals.length === 0 ? []
                    : item.attr_vals.split(' ')
                })
                this.manyTableData = res.data
            }

            else if(this.activeIndex === '2'){
                const{data: res} = await this.$http.get(`categories/${this.addForm.goods_cat[2]}/attributes`,{params: {sel:'only'}})
                if(res.meta.status !==200){
                    return this.$message.error('获取静态属性失败!')
                }
                // res.data.forEach(item =>{
                //      item.attr_vals = item.attr_vals.length === 0 ? []
                //     : item.attr_vals.split(' ')
                // })
                this.onlyTableData = res.data
            }
        },
        //处理图片预览效果
        handlePreview(file){
            this.previewPath = file.response.data.url
            this.previewVisible = true
        },
        //处理移除图片的操作
        handleRemove(file){
            const filePath = file.response.data.tmp_path

            const i = this.addForm.pics.findIndex(x=>{
                x.pic === filePath
            })
            this.addForm.pics.splice(i,1)
        },
        //监听图片上传成功的事件
        handleSuccess(reponse){
            // 拼接得到一个图片信息对象
            const picInfo = {
                pic: reponse.data.tmp_path
            }
            // 将图片信息保存到pics数组中
                this.addForm.pics.push(picInfo)
        },

        //添加商品
        add(){
            this.$refs.addFormRef.validate(async valid =>{
                if(!valid){
                    return this.$message.error('请填写必要的表单项')
                }

                // 处理动态参数及静态属性
                this.manyTableData.forEach(item=>{
                    const newInfo = {
                        attr_id: item.attr_id,
                        attr_value: item.attr_vals.join(' ')}
                    this.addForm.attrs.push(newInfo)
                })
                this.onlyTableData.forEach(item=>{
                    const newInfo = {attr_id: item.attr_id,
                    attr_value: item.attr_vals}
                    this.addForm.attrs.push(newInfo)
                })
                //执行添加的业务逻辑
                //lodash包提供了cloneDeep(obj)方法,进行深拷贝
                //这里使用展开运算符进行对象深拷贝
                const {...form} = this.addForm 
                form.goods_cat = form.goods_cat.join(',')
                
                //发起请求添加商品
                const{data:res} = await this.$http.post('goods',form)

                if(res.meta.status !== 201){
                    return this.$message.error("添加商品失败")
                }

                this.$message.success("添加成功")
                this.$router.push('/goods')
            })
        }
    },
    computed:{
        cateId(){
            if(this.addForm.goods_cat.length === 3){
                return this.addForm.goods_cat[2]
            }
            return null
        }
    }
}
</script>

<style lang="less" scoped>
    .el-checkbox{
        margin: 0 10px 0 0 !important;
    }
    .previewImg{
        width: 100%;
    }
    .btnAdd{
        margin-top: 15px;
    }
</style>